<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{
            margin:0px auto;
        }
        div{
            border:2px #ffbc4f solid;
            padding: 10px;
        }
    </style>
</head>
<body>
<div style="text-align: center;align-content: center;width: 100px;height: 100px;border:1px solid #000; border-radius: 50%">
    字</div>
<div style="text-align: center;align-content: center;
width: 100px;
height: 50px;
border:1px solid #000; border-radius:100px 100px 0px 0px">
    字</div>


<div><div style="border-radius: 10% 20% 40% 50%;width: 300px;background-color: #5060ff">圆角</div>
<div style="width: 300px;background-color: #5060ff;padding-left: 25px">wiojefoi</div>
<div style="width: 300px;background-color: #5060ff;padding-left: 25px">wiojefoi</div>
</div>

</body>
</html>